RFR: 8359395: XML signature generation does not support user provided SecureRandom [v4]

[Weijun Wang]

> New `XMLSignContext` property to allow user-specific `SecureRandom` for XML signature generation.

Weijun Wang has updated the pull request incrementally with one additional commit since the last revision:

  add implNote

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Changes:
  - all: https://git.openjdk.org/jdk/pull/25802/files
  - new: https://git.openjdk.org/jdk/pull/25802/files/56620819..5f766cc1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25802&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25802&range=02-03

  Stats: 16 lines in 2 files changed: 13 ins; 2 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/25802.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25802/head:pull/25802

PR: https://git.openjdk.org/jdk/pull/25802